The connection between Azog and Dol Guldur/Bolg working there
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seems to imply that Azog works for Sauron as well (in addition to the speculation that he's been...necromanced). Fimbul is Azog's "master hunter", and Yazneg looks much more likely to be on the Necromancer's minions (ala Bolg and Fimbul, all three wearing armor made of bodily remains), than a Misty Mountain Goblin which have totally difference outfits, basically comprised of loincloths and straps over the upper torso. Hence, the working assumption (which I THINK is pretty widely-spread at this point) that Azog, Bolg, Fimbul, and Yazneg are all minions of Sauron and/or are based out of Dol Guldur.

Yes, obviously it is speculation, but it fits and we don't have anything else concerning these characters thus far. My Top 5 Wish List for "The Hobbit"5. Legolas will surf down Smaug's neck 4. Bilbo will be revealed to a Robot 3. Naked PJ cameo as Ghan-Buri-Ghan 2. Use of not only 3D, but smell-o-vision, plus the inclusion of axes coming out of the seats and poking the audience when appropriate 1. Not only keep the claim that Thorin & Co. ran amok in Mirkwood "molesting people", but depict said incident in vivid detail!!!!!